I had a look at promash what is a target IBU to aim for? or that is the normal range?

Depends toptally on what kind of beer you are going for. Typical American IPAs along the lines of Stone IPA or Anchor Liberty Ale range from 40-72 IBUs according to BJCP standards.

The key for you I think is to go back and look at that recipe. I think you might have read it wrong, and those hops were supposed to be added in at stages during the boil. Not only will that cut back on the bitterness, but it will flavor the beer with hops as well, and create a much more balanced product.